Reddit mentions of KEEDOX® Mini Green 0.36 " LED Digital Volt Voltage Panel Meter Voltmeter 0-99V, Three-wires

This is the voltmeter I got. I think I wired it wrong for 2 reasons when I turn the pot down the display dims with the voltage, also it does not give me the hundredth place. I am guessing the smarter people in this sub will be able to tell me what I did wrong.

http://www.amazon.com/gp/product/B00A73W1CK/ref=oh_details_o00_s00_i01?ie=UTF8&psc=1

As for the wiring diagram I used Deepfreyed's

http://www.reddit.com/r/OpenPV/comments/20njm3/i_want_to_build_an_okr_parts_list_check_and_a/

But my mosfet broke so I don't have one...

And I ran all the grounds to the negative battery post.

Hope this helps.